package collection;

import java.util.ArrayList;
import java.util.Collection;

/**
 * Collection集合功能:contains()判断包含，remove（）移除
 */
public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(1,2));
        System.out.println(c);  //[(1,2), (3,4), (5,6), (7,8), (1,2)]


        /*
        boolean contains(Object o)
          判断当前集合是否包含给定元素o
          判断依据是给定元素与当前集合元素是否存在equals()为true的情况
         */
        //不需要考虑集合是否装到已知集合内
        Point p = new Point(1,2);
        boolean contains = c.contains(p);
        System.out.println("是否包含："+contains);  //true
        /*
        boolean remove(Object o):---------一般都不接收boolean结果
          从当前集合中删除与给定元素o的equals()比较为true的元素
          若存在重复元素则只删除第1次匹配的
         */

        c.remove(p);
        System.out.println(c);  //[(3,4), (5,6), (7,8), (1,2)]
    }
}
